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"A calm jar. You fill the jar with colored water and glitter. When you are upset you shake the jar and have to watch it until the glitter completely settles. The time it takes is enough time for you to settle your emotions." Everyone with kids needs one of these.
Calm Down Jar. It is really easy to make. The goal is that when they are feeling out of control, they shake the jar, then sit and watch the glitter settle in the water. When the glitter settles, they can get up. This one is a really great technique to use in lieu of timeout.